GRF (1-29) is a peptide which is also known as Spartan-1 and or Sermorelin. It is a fully functional part of GHRH and belongs to its amino acid chain. It lies on the positions 1-29 of the chain. It mimics the natural Growth Hormone-Releasing Hormone. Due to the modifications made Spartan-1 is more resistant to enzymatic cleavage and is more efficient in stimulating Growth Hormone production than GHRH itself.

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The scientific properties of Spartan-1 are as follows:

  • CAS Number is stated as 86168-78-7. 
  • Molar Mass is 3357.93 g/mol.
  • Chemical Formula is C149H246N44O42S.
  • IUPAC Name is L-Tyrosyl-L-alanyl-L-α-aspartyl-L-alanyl-L-isoleucyl-L-phenylalanyl-L-threonyl-L-asparaginyl-L-seryl-L-tyrosyl-L-arginyl-L-lysyl-L-valyl-L-leucylglycyl-L-glutaminyl-L-leucyl-L-seryl-L-alanyl-L-arginyl-L-lysyl-L-leucyl-L-leucyl-L-glutaminyl-L-α-aspartyl-L-isoleucyl-L-methionyl-L-seryl-L-argininamide.


Studies show that Spartan-1 helps in stimulating the secretion of growth hormone and improves the overall regeneration of cells. It supports muscle mass growth and increases calcium retention. 

Another research explains how Spartan-1 helps in fat utilization and bone mineralization. Along with reducing the risk of heart attack and helping cognitive function. 

Scientists also say that it strengthens the immune system and slows down the aging process.


Note; dosage information is only for scientific reference purposes. SARMs Central, does not condone the human consumption or use of this substance outside of a controlled scientific environment (i.e. a lab).

Possible side effects 

Possible side effects of Spartan-1 include slight tingling in hands and feet and joint pain.


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